Feb. 17th, 2012

steorra: Jupiter's moon Europa (europa)
[personal profile] steorra
One of the things that always amazes me about astronomy is the ingenious ways astronomers come up with to squeeze information out of seemingly tiny bits of data, and to find data in unexpected places.

This story about recent research on the star Eta Carinae is a good example of that. Eta Carinae currently appears to the naked eye as a fairly dim star, with an apparent magnitude of about 4.5, but its brightness has varied greatly during its observational history, from too dim to be seen with the naked eye at all, to being the second-brightest star in the night sky, after Sirius. Its bright episode lasted 20 years, and the peak brightness, with an apparent magnitude of -0.8, was observed in 1843. Unfortunately, astronomers at that time were not able to measure all the things about it that we would like to know about its unusual outburst. But some astronomers have come up with an ingenious way to observe the light from the outburst. The light from the outburst takes time to travel. Some of it took a while to reach some interstellar dust clouds, which then reflected it, sending some of its light back towards earth. That light is just reaching us now. So by observing the changes in the light reflected from those dust clouds, the astronomers can see changes in the light given off by Eta Carinae during its outburst.

Profile

Astronomy

April 2017

S M T W T F S
      1
2345 6 78
9101112131415
16171819202122
2324252627 2829
30      

Most Popular Tags

Style Credit

Expand Cut Tags

No cut tags
Page generated Jul. 28th, 2017 04:32 am
Powered by Dreamwidth Studios